This select will show you most of the database objects in a schema(columns, table,view,code), where this ‘search_source’ string is used.

You can add this into you sqldeveloper as well, as a user defined report.
To accomplish this you will have to do the following steps:
1) Open sqldeveloper
2) go to Reports tab(If you don’t see this tab go to the Menu choose view->Reports
3) right-click ‘User Defined Reports’ -> add Report -> give name and put the sql code as above into SQL input screen(you can leave the rest as default)
You can use this Search in sqldeveloper now.